Hi members,
i have newly bought a lambda pc 8300 computer but unfortunately when i put the power jack of 12 V to the computer socket the red light turns on and a beep sound heard but only black display there is no cursor. i compared the motherboard i have with some pc 8300 motherboards on the net and realised that there are four 2114 ram chip slots on the board but there is none of them. i want to know if there should be those chips on the board to have it work properly.

Unfortunately these are custom made chips. And this version is custom made for the Lambda 8300.

I was hoping in the future to create a ULA clone for the ZX81 in a CPLD, and when that is working, maybe modify it to work on the Lambda 8300. The custom ULA in the Lambda 8300 includes a ROM with the characters as well (and not like the ZX81, where the characters are stored in the BASIC ROM).

I have a working one, but I do have to fiddle with the brightness and contrast controls on my period black & white TV to see the READY prompt and the cursor. The beep sounds right, like the machine is booting. Maybe just a video problem? Have you tried the monitor output?